linux-kernel - RE: [PATCH 1/3] hv_utils: Add the support of hibernation

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Message-ID: <87ftksa8dg.fsf@vitty.brq.redhat.com>
Date:   Thu, 19 Sep 2019 12:27:39 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Dexuan Cui <decui@...rosoft.com>
Cc:     KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "sashal\@kernel.org" <sashal@...nel.org>,
        "linux-hyperv\@vger.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        Michael Kelley <mikelley@...rosoft.com>
Subject: RE: [PATCH 1/3] hv_utils: Add the support of hibernation

Dexuan Cui <decui@...rosoft.com> writes:

> BTW, for vss, maybe the VM should not hibernate if there is a backup 
> ongoing? -- if the file system is frozen by hv_vss_daemon, and the VM
> hibernates, then when the VM resumes back, it's almost always true that 
> the VM won't receive the host's VSS_OP_THAW request, and the VM will
> end up in an unusable state.

Makes sense. Or, alternatively, can we postpone hibernation until after
VSS_OP_THAW?

-- 
Vitaly